feat: /demo notes app

[matijamarjanovic]

WIP

Description

Notes is an application that alows gnomes to use the chain as their notepad. Each user can post notes using a transaction as well as from other realms (maybe have all thoughts in one place without having to leave comments intented only for the creator himself). It uses an avl.Tree as a map of address->Btree where the btrees aro user's notes collection. Notes also have 2 different "settings", either they are private or they are public, meaning that some notes of a user can be made to be visible by other poeple. I am currently looking into the implementation of namespaces as path parameters (not only addresses) but to my knoledge namespaces are currently being refactored.

Contributors checklist

• make notes tree and system to add, get and delete notes
• make a render function that displays user notes by taking the address path parameter
• implement showing users notes with no path parameters (by using std.GetOrigCaller() if possible?)
• implement private and public type of notes which checks who is the one reading them
• add tests

[Gno2D2]

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